Is CVE-2021-43801 in the CISA KEV catalog?

No. CVE-2021-43801 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-43801?

CVE-2021-43801 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-43801?

CVE-2021-43801 has an EPSS score of 1.52% (71th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-43801?

Upgrade mercurius to 8.11.2 or later.

CVE & CISA-KEV Catalog

CVE-2021-43801

HIGHEPSS 71th pctl

7.5

CVSS v3

NVD

Description

Mercurius is a GraphQL adapter for Fastify. Any users from [email protected] to 8.11.1 are subjected to a denial of service attack by sending a malformed JSON to `/graphql` unless they are using a custom error handler. The vulnerability has been fixed in https://github.com/mercurius-js/mercurius/pull/678 and shipped as v8.11.2. As a workaround users may use a custom error handler.

CWE-754

How to fix

Remediation Available

mercuriusNVD

Affected:>= 8.10.0, < 8.11.2Fixed in:8.11.2CVE-2021-43801derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

1.52%probability of exploitation in 30 days

71stpercentile

Elevated risk: more likely to be exploited than 71% of all known CVEs.

References

Patch3

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.